Inclusion Criteria:1) Have a diagnosis of PD 2) Suffer from the FOG symptom. Subjects must score 2 or more on item #3 of the subjective FOG questionnaire (FOG-Q)and exhibit two or more FOG episodes during a short, functional FOG evaluation procedure that includes FOG-provoking conditions (e.g., turns, doorways) and 5 laps of walking in a figure 8 shaped trajectory 3) Free of serious co-morbidities or acute illness that would make training inappropriate.